Reversing rolling mill



J. BAUGNEE REVERSING ROLLING MILL Oct. 10, 1933.

Filed June 19, 193.1 2 sneets-shee't 1 /nventqr': JUSTIN BAUGNEE a his a/Z-Zvr-n7s Oct. 10, 1933;

J. BAUGNEE 1,930,410

'- nnvsnsme ROLLING MILL Filed June 19, 1951 2 Sheets-Sheet 2 /n venl'or': JUSTIN sAucNE :3? 71219 a/Z-Za r neya i same diameter. that the rolls of Patented Oct. 10, 1933 1,930,410 REVERSIN G ROLLING MILL Justin Baugne, Diiferdange,

Luxemburg, as-

signor of one-half to the firm of Hauts Fourneaux & Acieries de Diflerdange-St.-Ingbert- Rurnelange Socit-Anonyme (called Hadir), Luxemburg, Lu'xemburg Application June 19, 1931, Serial No. 545,575,

and in Germany June 23, 1930 v 5 Claims.

This invention relates to a reversing rolling mill for the manufacture of sectional girders, etc., having an advanced friction roll mechanism, the rolls of which are also driven. The drive for these rolls is either taken from that of the main section, or the same are provided with an independent drive.

In both cases the drive for the friction roll section of the mill requires to be shut off immediately the material under treatment has been engaged by the principal rolls, as in lengthy periods of operation the principal rolls and the friction rolls necessarily run with different circumferential velocities, although produced with the It has been shown in practice the main mechanism are liable to more rapid wear than those of the friction section, for which reason the diameters, and accordingly also the peripheral speeds, are subject to variation. The result of this disconformity in the diameter of the rolls, which may be very considerable, is a drawing or compression (upsetting) of the material between the two sets of rolls. In the one case there occurs in the friction mechanism a lagging eifect between roll and material, and in the other case an advance motion of the rolls over the material, this quite naturally resulting in deformation of the material, disturbances in the operation and inner stresses in the material.

These difflculties have been counteracted by shutting oif the rigid drive for the secondary section immediately the material appears to have been engaged by theprincipal rolls, so that the rolls of the secondary mechanism run idly and are capable of adapting themselves automatically to the speed of the principal rolls.

This disconnection of the drive, however, is not sumcient to overcome the stated disadvantages leading to a defective product, as it is not possible with any. degree of reliability to fix on the exact moment for cutting off.

For this reason the rolls of the secondary mechanism are furnished with a novel form of drive, which disconnects them at the correct moment upon the advancing operation, and again engages the same at the proper time upon the reversal. Thisis accomplished by. furnishing in the drive for-each roll of thesecondary mechanism a one-way clutch, which is eifective in both directions of rotation, so that the drive for the secondary rolls is disconnected immediately the principal rolls have seized the material, and upon change in the direction of rotation is re-engaged before the material is secondary rolls.

It has been found particularly suitable to employ for this specific purpose an electro-magnetic and mechanical compound clutch, the mechanical section of which, constructed as oneway clutch, serves for disengagement of the secondary rolls, while the electro-magnetic clutch causes the re-engagement of these rolls when the principal mechanism is reversed.

The invention will now be described more fully with reference to the accompanying drawings, in which Fig. 1 shows diagrammatically a perspective view of the reversing rolling mill with the fric- 7 tion or secondary rolls situated in advance.

Fig. 2 shows the friction or secondary rolls in elevation.

Fig. 3 is a section along the line a'b of Fig. 2.

A is the reversing rolling mill which, in the form of embodiment shown, is intendedto serve in a universal four-roll stand for rolling out I- shaped girders, there being two horizontal rolls c1, c2, and two vertical rolls d1, (12.

B is the secondary or friction section of the mill having the two horizontal rolls e1, e2. The driving shaft 9', driven by a motor, operates the shafts i1, 1': through the medium of the intermediate gear wheels hl, ha, ha. The shaft i1 drives the rolls c1, c2 by the meshing pinions 7'1, 1'2, and the shaft izdrives the rolls e1, as through the meshing pinions is, ii. The rolls e1, ez of the secondary or friction mechanism normally operate only on those occasions when the material in, k2 is passing in the direction of the arrow f1, whereas when the material is being moved back in the direction fa the rolls e1, 62 act asv guide rolls, the top roller e1 having been previously lifted in order to provide greater space for the passage of the material.

According to the invention, there is fitted in each shaft section i2, i2 and i3, is a one-way clutch L. The one-way clutch is engaged and disengaged automatically, the same being disengaged immediately the material In, k: gaged by the principal rolls A when moving in the direction and upon reversal in the direc- 1 tion of rotation, i. e., when the material is moving in the direction f2, the clutches L are moved again taken over by the 7 into engagement before the material has been engaged by the friction or secondary rolls B.

As free-wheel clutch L there is employed an electro-magnetic and mechanical compound clutch according to Figs. 2 and 3. This clutch possesses the two coupling portions 0 and h. of

has been en- 9 facture of sectional are the pawls i, of

which 9 forms the casing for the coilL while It possesses on the outer periphery of its hub the teeth 1. On the inner periphery of the casing 17 which only one is shown, the same being rotary on a trunnion k. The pawls i move upon rotation of the shaft is in the direction of the arrow .fi against the ends 1: of the teeth 1.

If rotation occurs in the direction of the arrow 1:, the clutch runs idly. For the purpose of coupling in this direction of rotation the coil 1 of the electro-magnetic clutch is excited by current supplied through the medium of the leads m, m.

For disengagement of the rolls or, c: there is accordingly employed, when the material is moved in the direction of the arrow h (Fig. I), the one-way clutch i, i. it, while the electromagnetic clutch l, a, h is intended for re-engagement of the rolls an e: uponthe return of the material in the direction I: (Fig. 1). This reengagement occurs immediately current passes through the leads m, m, which takes place automatically upon the reversal.

It will be understood that no restriction is made to the particular form of embodiment shown,

and that various modifications are quite possible within the meaning of the above description and the annexed claims without departing from the spirit of the invention.

What I claim as new and Letters Patent is:

1. In a reversing rollin mill for the manugirders, etc., primary rolls, secondary rolls, driving means for the said secondary rolls, and a one-way clutch fitted in the drive for eachsecondary roll, meansfor disconnecting the drive for-the secondary rolls immediately the material rolls, and means whereby desire to secure by upon the reversal, the

' drive for said secondary rolls is again connected before the material is re-engaged by the secondary rolls.

2. In a reversing rolling mill, primary rolls.

is engaged by the primary driving means therefor, secondary rolls, driving means therefor, means for disconnecting the drive of said secondary rolls immediately the material therebetween is engaged by said primary rolls, and means for re-connecting the drive of said secondary rolls before the material is engaged by said secondary rolls upon reversal.

3. In a reversing rolling mill, primary rolls, driving means therefor, secondary rolls, driving means therefor, -means fitted in the drive of said secondary rolls for disconnecting the same immediately the material therebetween is engaged by said primary rolls, and means fitted in the drive of said secondary rolls for re-connecting the same upon reversal, before the material is engaged by said secondary rolls.

4. A reversing rolling mill having primary and secondary rolls, means for driving said rolls first in one direction and then in reverse direction, means for disconnecting the drive for the secondary rolls while the in the one direction immediately the primary rollshave engaged the material, and means operable upon change in direction of rotation for re-engaging the drive of said secondary rolls before the material is taken over by said secondary rolls- 5. In a reversing rolling mill, primary rolls, secondary rolls, means for driving said secondary rolls, means for driving said primary rolls to pass material toward said secondary rolls, means for disconnecting the drive of said secondary rolls as they are engaged by the material advanced by said primary rolls; means operable upon reversal of the drive of said primary rolls for connecting the drive of said secondary rolls to pass the material toward the primary rolls, and means for disconnecting said drive of said secondary rolls as soon as the material advanced thereby has been grasped by said primary rolls.

primary rolls are driven 

